convert an ADC sample with range 0-4095 to a signed fixed number

Update filter parameters (center frequency and Q). This recomputes coefficients but does not touch the internal state.

A special case of the bezier smoothing function ``` c * (1-x)^2 * x + (3-c) * (1-x) * x^2 + x^3 ``` where c=0 to make the slope horizontal at the en

Given the sequence of all powers of 2 and all negative powers of 2 (i.e. powers of 2 made negative, not negative exponents) excluding -1, like this:

Update the outputs as time passes to turn off LEDs and/or triggers */

A special case of the bezier smoothing function ``` c * (1-x)^2 * x + (3-c) * (1-x) * x^2 + x^3 ``` where c=2 to make an "inverted"/"spiky" easing c

Reads one new value from the input buffer. If it does not have a full block to process yet, nothing will happen -- the inputvalue wil